Chapter 3 Forces and their effects
3.1 Force as a vector 3.2 Vector techniques 3.3 Newton’s first law of motion 3.4 Newton’s second law of motion 3.5 Newton’s third law of motion Chapter review 27 28 34 35 37 40

The vector diagram above shows how a jet engine provides an aircraft with forward thrust. Ff is the forward push of air on the jet, Fa is the push of the jet on the air, and Fd is air resistance. The sudden change in relative air speed causes a large and sudden change in the lift generated by air speed past the wing. This can be enough to cause a stall. The aerofoil shape is only part of the lift generated by the wing. The transfer of momentum from air incident on the surface of the wing also contributes large amounts of lift. The amount of lift from this source is determined by the angle of attack. A plane flying upside down will maintain an angle of attack sufficient to generate the lift required. Lift coefficient, L = C1 × ½ ρv × 2A; therefore a doubling of air speed will produce four times the lift than at the original speed. Reducing drag for a glider can be achieved by making it small and light, having a small frontal area, a very smooth outer skin, and long and narrow wings. Broad wings provide lift at low speeds for take-off and, with flaps extended, extra drag for landing. At high speeds, swept-back wings reduce drag and lift, which is proportional to speed. The surface was pushed off by the increased pressure under the surface of the wing or by a high angle of attack. The sheets of paper come together due to the creation of a low pressure region between the sheets as a result of the faster...

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Rachel Shea
Physics 131 Lab, QL
Hasbrouck 210
Sept. 21, 2014
Abstract
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Questions
1. The parabolic curves open upward instead of downward because of the golf balls movement over time: where it is dropped from, to where it ends up. The ball begins close to the sensor, then drops to the ground, then bounces back up closer to sensor again, therefore the bounces correspond with the bottom curves of the parabola. If the data were collected from the floor then the curve would open downward. But because the sensor graphs the position from the sensor, the curve was upwards.
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...﻿Change of momentum is related to the forces acting on the vehicle or the driver. Explain how we can increase the safety of the driver based on the above statement.
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Centro de investigación y desarrollo de educación bilingüe (CIDEB)
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LAB REPORT
Uniform Rectilinear Motion
Teacher: Patrick Morris
Alejandra Castillejos Longoria
Group: 205
ID: 1663878
Abstract
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1. If the speed of light were smaller than it is, would relativistic phenomena be more or less conspicuous than they are now?
¡¼Sol¡½ All else being the same, including the rates of the chemical reactions that govern our brains and bodies, relativisitic phenomena would be more conspicuous if the speed of light were smaller. If we could attain the absolute speeds obtainable to us in the universe as it is, but with the speed of light being smaller, we would be able to move at speeds that would correspond to larger fractions of the speed of light, and in such instances relativistic effects would be more conspicuous.
3.
An athlete has learned enough physics to know that if he measures from the earth a time interval on a moving spacecraft, what he finds will be greater than what somebody on the spacecraft would measure. He therefore proposes to set a world record for the 100-m dash by having his time taken by an observer on a moving spacecraft. Is this a good idea?
¡¼Sol¡½ Even if the judges would allow it, the observers in the moving spaceship would measure a longer time, since they would see the runners being timed by clocks that appear to run slowly compared to the ship's clocks. Actually, when the effects of length contraction are included (discussed in Section 1.4 and Appendix 1), the runner's speed may be greater than, less than, or the same as that measured by an observer on the ground.
Inha University...